Regarding your first question, the sentence "I go to school by my father's car" is grammatically incorrect. The correct sentence construction would be either "I go to school in my father's car" or "My father drives me to school."
Now, let's address your second question. Sentence #4, "I go to school by car," is a generic statement indicating that you use a car as a means of transportation to get to school. It does not specify who drives the car, so it could mean either #5, "I drive a car to school," or #6, "I drive my car to school."
In the context where your father drives you to school, it would be more accurate to use sentence #5, "I drive a car to school." This suggests that you are the one driving the car, indicating that you drive your own car to school. However, if you want to highlight the fact that your father drives you to school, you should use the sentence "My father drives me to school" as mentioned earlier.
To summarize:
- If you want to emphasize that your father drives you to school, use "My father drives me to school."
- If you want to specify that you drive your own car to school, use "I drive my car to school."
- If you want to express that you use a car as a mode of transportation without specifying who drives it, use "I go to school by car."